*{
    padding: 0px;
    margin: 0px;
}
body,html{
    width: 100%;
    height: 100%;
}
body{
    background-image:url("../image/back/b1.jpg");
    background-size: cover;
}
.box{
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30%; /* 设置盒子的宽度 */
    height:60%; /* 设置盒子的高度 */
    background-color: #FFFFFF;
    text-align: center; /* 设置文本居中 */
    border-radius: 20px;
    opacity: 90%;
}
.top{
    width: 100%;
    height: 30%;
    font-size: 50px;
    font-weight: bold;
    line-height: 155px;
}
span{
    padding-left: 75px;
    color: red;
    font-size: 12px;
}
input{
    width: 300px;
    height: 25px;
    margin:20px 0px 0px 0px;
    border: none;
    border-bottom: 1px solid black;
}
button{
    width: 100px;
    height: 40px;
    border-radius: 20px;
    margin-top: 30px;
    margin-left: 30px;
    border: none;
    background-color: #0051A6;
    cursor: pointer;
}
a{
    color: black;
    text-decoration: none;
    display: inline-block;
    width: 100%;
    height: 100%;
    line-height: 40px;
}